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Re: CGI Sheets

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As mentioned previously your best source for dimensional data is from the various manufacturer's catalogs.  As far as galvanized steel sheet coatings, the applicable ASTM is A653.  The two designations you will see most often are G60 and G90.  This means 60 and 90 ounces/square foot (total both sides) of zinc which is about 1.0 and 1.5 mils (inch/1000) respectively.  How long these coating will last depends on your application.  For temporary exposure during construction but then sealed by a building the G60 is likely more than enough.  For mild external exposures such as a door way rain canopy in a non-industrial, non-marine, or non-tropical area the G90 coating is probably acceptable.  For more aggressive environments, you may need to paint over your galvanizing for a duplex system.

Thomas Hunt, S.E.

"Shiraz Shahid" <sshahid(--nospam--at)>
04/23/2010 04:12 AM
Please respond to seaint
CGI Sheets

I am looking for a table with properties (gage, weight, strength, etc) of Corrugated Galvanized Iron (CGI) sheets. Plus information on corrosion protection, whats the life of the galvanization used on such sheets normally.
Best regards,
Shiraz Shahid.
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